Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e62fcdfb9509ac3f44a78cceea04ab9b7d6bd943edb11c06226e6eacd6d4c93b' 
  AND token = 'LLgHH/InIu3/QpG6ktqKdq3t0cEbKY/QcEh6ZISfY4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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