Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a31954fd28727a348295940c0c6ab5e2ef5fcc892da1760d62769b67b358144' 
  AND token = 'iqrOCIK8NRQLHOZc2ua+j+ZQHe5Mo1eOfxbt2UYxCQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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