SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd68786b7d5b812da0fb3036ee304f2abe4ccc9e380e32528817d2aa64f365159' 
  AND token = 'onP9wN4YbU4B6dXu9c+IlSsQJmt5c/kUW4l8k/IBgjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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