SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c5367322b5f1590745067399abb90a959ecdf8cbeedaa4373155859b176f3b8' 
  AND token = 'RM+6YLyHeuT1OZGnQ2HcoNpgeuq/Y+uLZ5ejwusLXMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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