<input name="1130400[]" value="lorem ipsum" type="checkbox">

$form['1130400'] = [
  '#type' => 'checkboxes',
  '#options' => [
    '' => 'lorem ipsum'
  ],
];

<input name="1130400[]" value="" type="checkbox">

'#options' => [
  'lorem ipsum' => 'lorem ipsum'
],

<input name="1130400[lorem ipsum]" value="lorem ipsum" type="checkbox">