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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6450f7b3a6288e6f3e3d5112ae4278a63805b7d70b77edd335a3f921a08ef1d2' 
  AND token = 'osKGEQTAJLEEDbwf6+RtlaRy0tJTj7EJ5Qea0/+cU9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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