SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b69b65940e5d4ae3621be17e2ff8550303f93c5bf3da0393ab69121a5275662' 
  AND token = 'INU6vDnzUc1gDbMiYTGDZCcCX+4y9RZw47qw7K5xroo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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