Required: playing cards.
Setup:
One person takes the ace of spades and sets it face down in front of them, then shuffles the deck and deals everyone (including themself) a card, face down on the table. The remaining deck is placed in the center of the table. No one looks at their card at any point.
Voting:
The person with two cards inserts one card – the random card they were dealt for yes, the ace of spades (or whatever other card they were passed) for no – into the deck, then passes their remaining card (face down, so the recipient doesn't know what it is; they should just assume they get the ace of spades) to their left. Repeat this step until everyone's placed a card in the deck.
Results:
The remaining card is revealed. If it's the ace of spades, everyone voted yes. If it's not, someone voted no.
Edit to add a simpler version:
The first person places the ace of spades on top of the deck. Each person receives the deck and either does nothing (yes) or moves the top card to the bottom of the deck (no). After everyone's had the deck, the top card is revealed – ace of spades is a unanimous yes, anything else means there was a no vote. The deck can then be shuffled to obscure how many no votes there were.