SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7928684ad46971b70197645f2eb167ad2080d40c32ae1ba44f03910edd36c091' 
  AND token = 'm5DGzzo96yXtZU1YQLaWWXG/igc5ALaHThBa+//ZnF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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