SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f97e57773a85b10457255d944d042e003e2555e47eae0be939d7288c3629e58f' 
  AND token = 'oGng9RQnjf+nfZIB/HeZbTm7qLgKnWCFObzv9n2/AOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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