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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50b50a7e0daf1fa3742c2b75c6aaf44d0ea23d1f0ecdf392f7005d0c82d9929f' 
  AND token = '0k386w0Bc7Arfdh1X53qiGOh4dEYl3NfybVKF6DWKeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00215

JSON explain

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