Tockens are attempts to beat Quest levels. You spend one every time you attempt a level. It takes 60 minutes to refill one Tocken. Maximum of 5 Tokens may be refilled.
You can see how many Tockens you have and how much time you have left until one is refilled by pressing "+" sign near Tocken. You can also use Gems to refill lives, ask your friends for them or watch a Video and get one free.