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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '852f4f6826006152917988838ea6b50b647f7f09da719815691f29b4ab9a10ab' 
  AND token = '/8lVsO/jbc2tK3c2F9Le+LsIoISHfyw62qlamckq5FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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