SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '062376f8f44932f650753aa9aef82655a70043cbb1317b106a5c8aafe4669031' 
  AND token = 'CVBm0ZetoZVr7ABgankdISN2jZMqzMGzKaFeqxYhoYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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