Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b15627d0aa3d41049978600badb548de9fbc0a7a76e0e89e2bc405d468a80a04' 
  AND token = 'Ki9+gKWnadbzWk5w/GMsTzxKFn8awLRdst8w6tk3UMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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