SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f484d192f001d7305b3b68f2d6fb5fe55930b6cfc5b93b24eb49454bbd07d43' 
  AND token = 'HFXGx25KloaT5FtCKbgyyJBZOLgQQpKBBMwJWILSzek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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