SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a9111a216dfeb55c13d6b369c697bfcae33447d19308b94c2a7d723e17fb5bf' 
  AND token = 'TVLHvAtpz8nLsQF/PJRiVvp3a0VD85CF4bKnoUYd3BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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