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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baa559d31cdd94fc6bd55da06c4b186873a54e00c3df8ed1dc020fe64ae00708' 
  AND token = 'TXyfua0gC5MHtCDxdi0LIYzyY85o5DdjqoPczf3lTnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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