SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f3fb4c794317e6087e3d90c480562c0c446470273a7f63485560932d349209f' 
  AND token = 'ceHXZrdYayDNS/5QPSd2nAk4gqbtpjVYz+Rw5XGzg3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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