SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'febd1ef6eab55d3ff5fa3c055a79da3a5c723c6721e73785b6d251f17cb9e0b7' 
  AND token = 'VB0Dx8rGMOhps/g/ebe6EiswYH4m+gn5+iZbhzJ0FsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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