SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b228398c49c4a3dd9673718e81dfe6af3dd431a28ee39811316d7bacada0b5bc' 
  AND token = 'X+kzkgijmCwsCxhYKdS7+9qcBqcD/cFYJTfKdZotRXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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