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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd84fce7ab4fd21f93c9ac7b5ae747b9a5b898c8d88ee8e20fd92a9da6fd9d55c' 
  AND token = '16f2+QTD29YVN4JTCehiUttCxIBW40FV2hnRvVqZcR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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