SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f7eaae91a3903b6895b69f0a2f99a532a768cf865e6f684ed3b830a14a6dc52' 
  AND token = 'lEmVj8K9Gh0PHiCxuw2clorvsgiKLhRyRyiKM16vM4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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