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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5eb5887b5cdf89dc0506cf941c330643055fbc5ff5c63c868468691a52af728' 
  AND token = 'cWa1WGjAySA8Js3SekprVfClbTv8vxSWQ80tedesWCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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