SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd8dbbdb05f288c17580c1d3f6c11f11ad5dc782bbfdb7efe33167d565c50419' 
  AND token = 'CCl8mCXvBWqQSWNrFuJsnKuvKXEwI9VRqhMViE5O7Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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