SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93c68a34a931e7662f70f45ab142cc7fe7c5c7bda0b7213a4f6ff6c86a2002ef' 
  AND token = 'YIMfyjH+o9kjvw8QDizCVvVjwMyeKSShGlUxEUCtCdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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