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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a688f04a585c0fffdb5e4fb88b2ec0a6baaf2cb48c904ec7bac768eb5297a5f8' 
  AND token = 'C1eMRzJvovmyYNqAqWE14t9l6Zke8T2/3gUbOvinXxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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