SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4de9c2a52ebcf02124552d975d4374acc5b5f326356b24af632b13b22e59fcdc' 
  AND token = 'uzDm+T1WdsgWksxuz9gZ8PfYi3yb1qZhUCGXZtqmlpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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