No. You are kidding. You MUST be kidding...
No. Not at all.
The trick is not to let it just ‘air dry’. Although the circuits in the keyboard really won’t be effected by the moisture, but you need to let most of the water drain off and then blow dry it.
That will prevent any desposits sitting on the circuitry and causing oxidation.
I’ve done this for years.
And not only on keyboards.