Are you saying the keyseat is too long? or too deep? If you measure across the keyseat to the bottom of the seat, for a 3/16" key (.1875"), it should measure 3/32 (.0938) or a little deeper. The average guy doen't have the proper tools to measure things like this but if you have a dial caliper you can check it.
I would be more concerned that the key seat is worn, and if that's the case you'd be better off making a new shaft or welding up the end and having a new key seat cut. Preferably a woodruff key that won't work out. If that's the case then I'd also get a new coupler sprocket, lovejoy coupler, or whatever couples the pump the the shaft.
If there is just a space above the key when the shaft and coupler are together, a set screw above it will hold it down and that's how most are done. Then the key can't wiggle and wallow out the slot, and it stays in place.
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