Air carrier Captain reported gusty wind conditions led to an overspeed while on initial approach.

Narrative

I was the Captain (and the flying pilot) of Aircraft X; operating between the ZZZ and the Lester B. Pearson International Airport (CYYZ); Toronto; Ontario; Canada. Day VMC conditions prevailed; with gusty winds out of the south/southeast at roughly 160° at 12 knots; with gusts to approximately 25 knots. We joined the final approach course to Runway 24 Left approximately eight or nine miles out from the runway threshold.At waypoint KIREX (approximately four miles from the runway threshold) and indicating 160 KIAS on my Primary Flight Display (PFD) airspeed indicator; I called for flaps 45° (landing configuration flaps setting) and the Landing Checklist. Moments later the aircraft experienced what felt (almost) like a wake turbulence encounter; but what was; I am sure; just a strong gust. My First Officer (FO) even asked; if we had just entered someone's wake; but; with the direction of the prevailing winds (a nearly direct crosswind); I feel like this was just a strong gust (unless it was wake from an aircraft that was on the downwind leg and on a reciprocal course to ours). A moment or two after this; the overspeed klacker" sounded for an overspeed condition based on our flaps and landing gear configuration. I immediately looked up at the airspeed indicator tape on my PFD to note that it was indicating 165 KIAS and then glanced at my FO's airspeed tape which indicated approximately 169 KIAS airspeed. I never saw either airspeed tape exceed the 170 KIAS limitation for the flaps 45° configuration; which leads me to believe the sounding of the "klacker" was erroneous; but that doesn't mean that the aircraft did not see a momentary overspeed somewhere that I was not quick enough to catch. I reduced engine thrust to both engines; to reduce airspeed.The remainder of the approach to touchdown on Runway 24 Left was turbulent; with continuous gusts and buffets from the crosswind conditions; but the touchdown was uneventful.After arriving at the gate; I called Maintenance Control to discuss the approach and to place the proper write-up into the aircraft flight and maintenance log.In gusty wind conditions with airspeed gains and losses due to shifting and gusting winds; it becomes even more important to do everything in one's power to manage energy state of the aircraft to the very utmost."