SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f1119e48a43afaee151b88ac1364254272cd869b9b912681e0d354369eb2d55' 
  AND token = '8CRwmvK780TcHNFXK/uAmqSAbsrLZwyLonO+kbExMBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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