Tokens do not expire. You will not lose them if you do not open them. Once the store expires you won’t be able to purchase more tokens, but you will be able to redeem tokens aquired earlier.
That refers to any tokens - they never expire. The mechanics are only slightly different for tokens that were usable with vaults. You keep them but the “vault” part is gone so you don’t increase a chance for the top reward with each pull - it will always stay the same (but the pool of rewards is token-like).