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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c93103154fc917bb79085e4a6665f08a091cdbad023254654a0a76211c9135f7' 
  AND token = 'gEQB7rcOK7QyJj2TMCkN0IxIllFLPxjEI9NKIWHRSCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}