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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c549b5b83ee4134fcffcf1cccc99c7f3da8012a80cc270543ab60e5fb5910299' 
  AND token = 'LRNQhcIn34wUtvNfthnyWfe/VepzlL0w6Scot0D/N+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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