SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeb5391d2adf4261253449212d42fc85df01b78e7f7c5c33bf09316c9b26f899' 
  AND token = '3iPwcpBQ++kkOE1xKS1pFPfWV9Rg0IHo+BgosdmqpJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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