SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9867dff3a9f4df8b5d3db6ab602bfce678bfcb2d44e265e3dcc92f67a549dc05' 
  AND token = 'ZfA6TS2wjSeGWpPsqGpSywvJNYoVLSOKZSSSEohn/po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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