SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88312f5dac330ff8a144918fbb3b56544c33b31d292d6fe9a76abef5be678ef5' 
  AND token = 'X3ZOqWwJiq/Ffq8RxY6q0il6CG65WcJziYdFggH5KoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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