SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4e924bce59d964a775516f55225bbb9838b2eafc17bb2227b4132a7f7316268' 
  AND token = 'lph+P/VlIYWevSj2b78+2l02mBxQbpO5GGHDR/ww/B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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