SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '189795249c76bf0fa2768cd1b65ba74b88d6fc492dda350abd17addb77166bec' 
  AND token = '6jDuYylw+KO02hhIPhiV0XoxF/hgvrHxNjnHz4sX8vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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