SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8133b6cd92c3c72be45917a94ec4f56a70bda9115b52a1886f92927c4affd8e8' 
  AND token = 'EAQWyvFRA3hQKjsWkJeCabxwd6lByuj79JRuDCTzVZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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