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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4c916cc50513eac1e959717ab57afdf70ed65328f8dfa8dc83a84e1640fa44d' 
  AND token = 'LKZxadUfBx2tG8IPC/09uqe78JtC/uFCqKWEdr0Xb2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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