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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19935b0cb49c371f9e2ae54bc52ce846a18f84ca464ea7fdcc680af12ceb26c2' 
  AND token = 'LE5DjbJ8IwWpynyAdVL7zmn0Mn5k4nTN6ed8JnQ2UnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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