Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd919c8c8d09edc9b73dfb476ef69814bda04c7fbd965d97489891a8b6722ab5' 
  AND token = 'yW68ZDBM/JbRdtPYQXsij1iwIwE38zwxF7T39cPJuuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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