SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a84f2db3e7c51a94ee3134d6f4d37a92a726c3af4795e0682df0ad5ba497954d' 
  AND token = '1BYf3BhFAiQB73tMK7v6y7glvmHwZRqoFiEznQlHx04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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