SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a1dff3e9880b038ca690f7810011acb7063dfb30bceb3bc2b56ef85613827a8' 
  AND token = 'Uma+GRtcJPbgg2jyY7zJNDhDzm/VjglBFMp1iRVhEB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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