app/views/devise/mailer/magic_link.html.erb
<p>Hello <%= @resource.email %>!</p>
<p>You can login using the link below:</p>
<p><%= link_to "Log in to my account", magic_link_url(@resource, @scope_name => {email: @resource.email, token: @token, remember_me: @remember_me}) %></p>
<p>Note that the link will expire in <%= Devise.passwordless_login_within.inspect %>.</p>