SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37fded627185235e8802f11cb3d123a30f5ef7952e77c82cf77a44df258f6e50' 
  AND token = 'Fr0atdRogJYWWPDqBqk2hu07nKRR0UkUx7jDIZhgvJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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