Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '479e4779fa80c4055865363be797bf8a557c71e31de898d7635720ed8c429b54' 
  AND token = 's8Yka/htSIgroAGs02n+fNnfJWDWzyIWEoSmaBpTdqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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