Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73d0f2f716642bc66ac23b34893ed20d618c2ad10dea43afc4bf041a30585ee6' 
  AND token = '/P4/ZLFrprN370l8cuIG/2gjSB3eo/0pFoplbDfEqX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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