SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f07094c8c629cca0d43a85f1217c0604b5aa6ac7e331dc2e9b486772f16ebaf6' 
  AND token = 'sT4JQYF9txJ7HwR46TlqmnubrzYX1QIY/LjJZ3FJz3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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