SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42ed29f0d634ed3337160e3d97874e14f6c08f64763d2c787eb431c4fb28a95e' 
  AND token = 'V+6w3mKz+YY4KyguxuSc7n7/40BuE2mBq0XxTr4Cbks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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