SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a087c1615163f05f21296314b0236f51ed261545c858caff36cbc28df3565bd' 
  AND token = 'J+igzXZ/DPkd7k4NYuvjYWAq5I0Q0uZuq2zZn3zPRBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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