SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b08f64de27cf1bac6bbe17cb9a172399c895707042c4ed5301cd5689ca0294a' 
  AND token = '6WXyS/z8oH/Cx/nv2xfYHZ//mHDcpKDH229BOiQKfBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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