SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62eff71b19ae990b86d41f59bff2f8a1825279261d7b5402152f4a86997ff54f' 
  AND token = 'N+9KkzwNQhZxZ8uY3w6jmYFrd/iM0SL0syhfT9ECDMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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