SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '809f596b892ffcfaf6fb8313cdba4cdba91d669200598c1f7bfb1b358fdb7c57' 
  AND token = '48KTw2wXwoKHJG0YFmMRSjVT0fLMMLmw0/9zFoisxz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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