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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '262a6812134d9a5709815fcf997803ace6b8e9ddf1c5ee768e2d3515a22845ed' 
  AND token = '5QMXlIb5q6thc+Ka7m9f8s3Q+yoFkfay/31pqnxJxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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