SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9349366e1e19197649d97b9909c041c28131d2670dc6b3eba4f73afc5af6853' 
  AND token = 'kYa8+/RyJaJY3TJxDh9X8vv4KjQ2jxXPOclhanRCVL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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