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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '200f9c0619fcb122bb9512f13a6b9cce183bdcd6aff77cbfd72d63ed8ca66ee9' 
  AND token = 'fm9cUMF8gIKvUchTPak5lUu3WUaJhrOTt7x/pTVYUwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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