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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf99ac23dd0d3bb37eda8386007b501bdfec37d40d0876d1783c0bf0a0bfef76' 
  AND token = 'eZtQJBEDtDBRprIpIPnnn1I8D9jfdZj72VZ3L6BZoOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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