SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dba171918d7b659fcf48a3342c1ebc806dbd70492e83d6751dfd4281072b8ed0' 
  AND token = 'vJi9vu8GF4OG/ZByqGN/QZ3WctNc9cmviHjqjVOX4i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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