SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aef1678635fe38c4cd50668225988aef6d92c4906cd5ca6e488b295c631470f' 
  AND token = 'MvB6Z8P8hVYMS9e2l+C3BJ6VQFEJLqaSXVzun0ERFps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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