SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8973435d8ef469ad0065a3eee9632bfba5b836daed7946d7d4c2e098e1f85262' 
  AND token = 'PWHGCSkKKOYrhKbVwL4JGRR0pjikYMwdx7UcjqGiacg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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