asyncpg没有类似于psycopg2中的keepalive选项，但是可以使用新的TCP keep-alive机制来达到相同的效果。可以使用Python的socket模块来设置TCP keep-alive套接字选项，并将asyncpg的连接传递给此选项。以下是示例代码：

import socket
import asyncpg

async def connect_to_database():
    conn = await asyncpg.connect(
        user="user",
        password="password",
        database="database",
        host="localhost",
        port=5432,
    )
    # Get underlying socket of asyncpg connection.
    sock = conn._transport.get_extra_info('socket')
    if sock is not None:
        # Enable TCP keep-alive with a 10 second timeout.
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 10)
        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 5)
        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 3)
    return conn

该方法使用asyncpg.connect()连接到数据库，然后使用conn._transport.get_extra_info('socket')获取基础套接字。通过调用sock.setsockopt()来设置所需的TCP keep-alive选项。在上面的示例中，我们使用了一个10秒的TCP keep-alive超时，每5秒检查一次，最多尝试3次连接。这个值可以根据客户机TCP keep-alive策略的要求进行更改。