SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22f64135de2c8fa299c48ec327dd5a7a466ce613da42dc5b6608cf988d32fd51' 
  AND token = 'YLp+7VXipg+Pq1ZW07/W08GEHQ4hQGrOxFEZzAQJrio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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