SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '867d102f35883bfbe67eebc571bb746704c86e368b539315f2d29b1a4c813a03' 
  AND token = 'tDbPp4GhmMLJDVDrgXacUdgBoO2KlqXC8G/2B7BeUmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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