SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc65219bf9c1b5a6ff4b4c4403a118d9f8c5db068283c3708952bac0457b5f1' 
  AND token = '6erw5+bff9XgRY+XjTMTIZ3715rFAxqLZ/3sJlPWk3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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