Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab5fab394a4365a38eb95e230a5320fddb58348f4c4b0b6e123ff0a7c70b1cb3' 
  AND token = 'b+PSx3CtJAyqLE3V4UA2cE6leu/w3mFv8mYdT+SeSn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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