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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ed3eac8f578bd4fb7e97ef568f34346c3526e73b4ebde2b10a39b65754d3cdd' 
  AND token = 'W4vZms+aDIIOn1BOO7uoVucH1VSnYla3PXdu77g8/vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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