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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29dbfc30b8d2eb8ccfb6bf45d2c34b8f68a28d865bbc3c397a5495db9ba6acac' 
  AND token = '3hemOPRyJhMOf4Z0qfGkTVcUFYKSJDUQRTuhYQ+gTGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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