Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9e035e8cc9ee16441621d41c17e3e6ee266b3c35f050064c7d5dfbada1be03' 
  AND token = 'FKyey8lGyhGmxfO9gk2/fFxQV9cJAWRcIOl0ocwg5yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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