SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '895d3c9870c28fbfa693846643b023787f696dfd72e8d41c84ad45cbe7b93735' 
  AND token = '4jc3dq2J/WZlvtFMkIM7buvFBXQE/9Y8fcH1wUQjCr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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