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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52722739c93d61e919ff5ce0ba5283ac48338bdde7e03ecb5e851d96cdc1c294' 
  AND token = 'iorSv92QwDX6pDznVINyn63B4mwgzN9fbkloYzHfqX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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