SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f002be6c4d3d5a365ca0729362749ed589af8c587089c209477e2b5f760735a' 
  AND token = 'FxGMRdr/o7KbJzDnnHBHDrKGwqpd98nFJ45ON9VsUvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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