SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4434032ae0ecce3e03820faea544c3d0300ff1e71e6903714ef5d7ec3991562' 
  AND token = '4izQ4uKLJ0GBC9BbXtOvQxqZCmjK+0+aGAbGL1C+OVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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