SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '287ac066dbe3b880a2f943a6837caca832779c5a169bf4ed35fa29f7ec554d7c' 
  AND token = 'VUQO48u7sx1G6jF19mqh0NlJnHBPVduvhP5W6SpEuZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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