SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9ddc2eb833a4cf6bc6fb407a224a1dbbedbb57affc93706a6835645be2d5f95' 
  AND token = '5toh0Yx86iTmnJZaxzQ6PrSzZPguqCDVLCkKXuJ/e/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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