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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1927ff389505a99527bbbc036326b5b722d4fd3929a8f8e749e42be6e93ef107' 
  AND token = '7RzMtX/WJ1NKMkArwidIKaJF78Tl4pVFN1wBy5Jorxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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