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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6f70da9c8190c74699b8c8822880c5176381a04512079ede147ace6fc3cf588' 
  AND token = 'NDPL9H7gS35rqKkh07DS00qyRN/KPnuO1CN9HIls0JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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