Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4f21564f67e583c9604288fcae15c5059d02920dc1048cead588c2ff723bed2' 
  AND token = '25MbFQksIf7uVwByWVOkWkowHj0NQ9W2FEWTGZv/y8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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