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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25538d6ad9cdc4cf77695a81a5b79715456e8b1c79048ec7a9968ea391334cb2' 
  AND token = '1YJLnvLseS8dMLstadyNQ2ol+xOEkFuFu00+KLCyE48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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