SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '418481739411947f2ebfc2461d01924582192342b18b21d422ad33689feacb6a' 
  AND token = 'G5kMO/qgQfZT+80gFZmECEEJr48CDaYIuRUNlAsGXXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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