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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d14269e163aa4633379f7b14ddf72dd28ac8b9ccff12110ce7947798c8733e9' 
  AND token = 'aIbIPxDPRDo8gXnFW2QcsV09BXuNfkMiZ02v0rZ73do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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