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Hi Alvaro G, Your settings look fine to my config. Though your issue is with dnsmasq:
jul 04 17:40:32 Opal dnsmasq[496]: advertencia: interfase wlan0 no existe actual

wlan0 is not available to dnsmasq for some reason, i'm not getting this issue.

I'm using a PI3 with a usb wifi dongle. With this setup wlan0 goes to the usb dongle and wlan1 goes to the internal wifi.

If you look at ip addr
wlan0 has ip (hotspot)
wlan1 has ip 192.168.0.# which is internet through the router

but if the usb wifi dongle is removed and you scan for the hotspot it is not available.
so wlan0 is the usb wifi dongle.

If your usb wifi is not able to be used as an access point then that may be why it's not working.

You can try the other suggestion I made to keith which will make the internal wifi a hotspot instead.

Change your /etc/dhcpcd.conf file to
nohook wpa_supplicant
interface wlan0
static ip_address=
static routers=
static domain_name_servers=

then you need to start wpa_supplicant on wlan1 yourself, you can do this manually with
sudo wpa_supplicant -B -i wlan1 -c /etc/wpa_supplicant/wpa_supplicant.conf

You will need to run it at start up which can be done by adding it to the bottom of the /etc/iptables-hs script
wpa_supplicant -B -i wlan1 -c /etc/wpa_supplicant/wpa_supplicant.conf >/dev/null 2>&1

I Hope this helps, let me know if not