SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a23f812961792ee57f9641169ed7d888e42e0435fbe3a01b925a5044d4bec16b' 
  AND token = 'H625+/Up9hfk/tYOhlITNgTivhs5qzCBcqQG0THX31s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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