Care to map the phonics path from quay to "key"? "kway" seems like the most reasonable pronunciation unless the letters are just meant to be strokes in a pictogram.
So it's not so much a word that you go "ah I'm so clever I can pronounce it right", but more one that you go "some people along the way started misspelling this too often and the people who knew better didn't do a good job in correcting them".
And why should I know how to pronounce a word that current anglophones don't know how to spell? It's a tongue-in-cheek question, people.